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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ad2e2fbbfb79042b0a828cf535bfef8531eaa9642a3c73dd9d6b365c410213' 
  AND token = 'KhHW0nixtn4+5QNoDm+UlYlI2bWPJRrchoagi/dWm/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}